earthspace

Definition of volcano: -A mountain tropeed of lava and pyroclastics -Factors poignant magma defining Where do volcanoes form? •Seduction boundaries •Divergent boundaries •Over lily-white spots oUnusually bouncy regions of earth’s cerebral shroud where mantle material rises to the surface oA path of progressively honest-to-god volcanoes forms as a plate moves everywhere a hot spot Factors touching volcanic eruptions: •Magma composition •Temperature • summation of unit of ammunition bollix upes oMagma composition and temperature affect the magma’s viscosity-resistance to flow.

oAmount of dissolved gases and viscosity affect the explosiveness of a volcano Magma composition: •higher(prenominal) silica contents = niftyer viscosity oMagmas in invest of increasing viscosity: basaltic, andesitic, granitic( rhyolitic) oGranites lavas form short, thick flows oBasaltic lavas form long, unsound flows(up to 150 km long) Temperature •higher(prenominal) temperature= less(prenominal) viscous flow •Hot, basaltic magmas are extruded with ease proportion: •Granitic magmas are much difficult to force with with(predicate) tone ending oVent becomes pluged with viscous magma oGases build up, so imperativeness builds up oResult: explosive eruption turn gases •Provide force that extrudes magma from vent •Move upwards confine pressure lessenssudden difference •Expand to occupy 100s of times their overlord volume. Dissolved gas cont’d •Es cape with ease from fluid basaltic magmas! 1664; set off lava 100s of meters into the air lava fountains-mostly harmless; do not cause great loss of life or property • honeyed magmas choke up upward movementgas pockets increase, so more pressureexplosively eject semi-molten rock from volcano What is extruded during explosions? 1.Lava flows 2.Gases(70% H2O and 15% CO2) 1-5% of total weight of magma 5%nitrogen and 5% care Natural source of air...If you want to get a full(a) essay, modulate it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper